Accession Number : AD0615073

Title :   EXTRACTION OF FE (III) AND IN (III) FROM AQUEOUS HC1 BY TRI-N-OCTYLAMINE IN NITROBENZENE,

Corporate Author : NORTH DAKOTA STATE UNIV FARGO

Personal Author(s) : Nelson,A. D. ; Fasching,J. L. ; McDonald,R. L.

Report Date : 21 MAY 1964

Pagination or Media Count : 10

Abstract : A study was made of the distribution of Fe(III) and In(III) between aqueous HC1 and solutions of tri-noctylamine (TOA) in nitrobenzene at trace metal concentrations and under metal loading conditions. The equilibrium between tri-n-octylamine and HC1 was also investigated. The equilibrium constant for the reaction TOA + (HC1) = TOAC H1 was found to be 560,000 over the amine salt concentration range .0017 to .095M; TOAHC1 appears to be an essentially undissociated ion pair in nitrobenzene. The metal extraction data were interpreted in terms of the extraction of the tetrachloro metal anions. The possibility of the addition of one or more amine hydrochlorides to the extracted metal species must also be considered; these 'extra hydrochlorides' are not bound directly to the metal but, rather, are the result of electrostatic interactions. The results give not only an interesting example of the effect of organic phase ionization on the distribution ratio, but also emphasize the hazards of drawing conclusions concerning the metal species extracted from equilibrium extraction data. (Author)

Descriptors :   (*IRON, SOLVENT EXTRACTION), (*INDIUM, SOLVENT EXTRACTION), (*AMINES, SOLVENT EXTRACTION), (*HYDROCHLORIC ACID, SOLVENT EXTRACTION), (*SOLVENT EXTRACTION, AMINES), NITROBENZENES, CHEMICAL EQUILIBRIUM, COMPLEX COMPOUNDS, MOLECULAR ASSOCIATION, DISSOCIATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE